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G. S. R. KAIVIPMANN.

DEVICE FOR SHARPENLNG SAFETY RAZOR BLADES.

APPLICATION ELLED SEPT. 20. I919.

1,324,12L Patented Dec. 9,1919.

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GERHARDT SIGVERT BEHLING KAMPMANN, 0F TEGAL, JAVA, DUTCH EAST INDIES.

DEVICE FOR SHARPENING SAFETY-RAZOR BLADES. v

reenter.

Specification of Letters Patent.

Patented Dec. 9, this).

Application filed. September 20, 1919. Serial No. 325,221,

To all whom it may concern,-

Be it known that I, GERHARDT SIGVERT REHLING KAMPMANN, a subject of the Queen of The Netherlands, residing at Tegal, Java, Dutch East Indies, have invented certain new and useful Improvements in Devices for Sharpening Safety-Razor Blades, of which the following is a specification.

This invention relates to a device for sharpening safety razor blades (Gillette and the like) of the type whereby two sharpening rolls are rotated in the same direction while the blade is held between same in an inclined position in such manner that the rolls are caused to act on the two cutting edges of the blade. In order to sharpen the blade at both sides the blade can be turned in the known manner, either by hand or automatically, after which the direction of the rotation of the rolls should be reversed.

According to the present invention, there is provided a device of the character mentioned wherein improved means is employed for automatically turning the blade to insure of the moving of the blade away from the rolls preparatory to the moving of the rolls, so that it is practically impossible to cut the rolls during the sharpening operation.

This result is obtained by the use of planetary pinions for driving the rolls, said pinions acting on a central wheel whereby the blade may be turned by hand about the axis of its clamping device and after this being done the blade or an arm of the clamping device takes up the rolls these as a whole being rotated about the same axis at the same time rotating at a relatively high speed about their own axes.

It is obvious that the condition of friction of the various moving parts is material to the pressure exerted by the cutting edges of the blade on the rolls.

In the accompanying drawing the figures illustrate an embodiment, which is only meant as an example.

Figure 1 is a perspective view of the device.

Fig. 2 is a sectional view through the axis.

Fig. 3 is a transverse section on the line A-B of Fig. 2.

Fig. 4 is a transverse section on the line 0-D of Fig. 2.

Fig. 5 is a view similar to Fig. 3 of a modified construction.

Fig. 6 shows a detail of the construction shown in Fig. 5.

The axles of the sharpening rolls a are provided with pinions b, which engage as planetary wheels the wheel at, the latter being secured to the bottom plate 0 of the casing of the device.

The roll supporting frame, in which the axles of the rolls are journaled consists of the two plates 6 and s which are connected by four bolts h. The frame 6, s, h is at one end pivoted about the trunnion of the bladeholder g, and at the other end about a con centric ring f on the fixed front wall 1" of the casing.

The blade holder 9 consists of two parts, the part u made in one piece with the journal and the part 0 to which the hand crank z' is secured. The part to is channel formed and at one end provided with a collar 2?; an arm m is secured to the other end. Said arm is provided with a hub portion 9 in which the part 0 fits. The part 21 is prevented from being removed out from the casing by the collar t. On the other hand the part 0 may be drawn out of the casing readily. The part 0 is provided with two projections '0 adapted to fit into the usual openings of the razor blade and can be pushed into the apparatus through openings w in the front wall As soon as the part 0 is fitted into the hub part 9 of the arm and the overhanging portion 7) of the fixed crank hub fits around the axle portion a,

the blade is clamped in its place and its cutting edges 70 and Z may be pressed against the sharpening rolls a.

On turning the hand crank 2', the edges is and Z are pressed against the rolls, the

latter are pushed back and forced to revolve at a relatively high speed about their axes, at the same time the frame work c, s, h being forced to rotate within the casing. As soon as the blade is bent to a certain extent, the arm m comes intocontact with one of the projections n of the plate 6. On turning the crank in the opposite direction, the blade first comes into contact with the rolls at the opposite sides before the latter may begin to rotate.

The arm m serves to maintain the frame work and rolls in proper position with respect to the axle g and the blade and also prevents excessive bending of the blade.

Fig. 5 is a view similar to Fig. 3 of a including a casing, 21

d can] modified construction, showing means for obtaining an exact adjustment of the blade axle g or the blade clamping device with respect to the rolls. Therefore the projections 12 are fixed to members n a of sheet metal (one of same being shown in Fig. 6), said members being mounted rotatably upon the blade axle. Each. of those members is made adjustable by n'ieans of a screw w secured in the plate e of the supporting frame 6, s, h and a slot 1 each said members n 72?, so that an exact determination of the bending of the blade and of the pressure of the cutting edges or same on the rolls can be obtained.

Having now des need and ascertained. my invention, I declare that What 1 claim and desire to secure by Letters Patent is:

l. A device of the character described stationary gear carone end Wall of the ried concentrically oi casing, frame jour led in the casing and concentric of the go a blade holder having its axis rotatably mounted centrally of the end Wall the casing and concentric of the gear and e sharpening rolls ii provided With trunnions journaled in the frame, planetary piuions carried by thetrunnions of the rolls and contacting with the stationary gear, means for rotating the blade holder and coogerative engaging means on the axis of he holder and on the frame and adapted effect a connection between the holder and the frame for rotating the from the holder When the holder is rotated.

2. A device as clai in the cooperative e ed in claim 1 Whereieing means include projections carried 1 frame, and an arm fixed to the axis or the blade holder for coaeting With the projection to cause the trunnions of the rolls and coacting with wearer same to rotate about the axis of the blade holder during rotation of the latter.

3. A device as claimed in claim 1 Wherein the cooperative engaging means consists of plates having their inner ends loosely arranged about the axis of the blade holder and the opposite ends adjustably connected with the frame so that they may be adjusted relative to each other, projections on said plates, and an arm fixed to the blade holder and designed to coact With either of the projections to in consequence cause the frame to rotate about the axis of the blade holder during rotation of the blade holder.

a; A device or the character described comprising a cylindrical casing, a stationary gear carried concentrically oi the inner surface of one end Wall of the casing,

a concentric ring carried by the inner sin:

t'ace oi. theother end Wall of the casing, a blade holding; and clamping device having its axis journaled in the casing concentrically of the gear and the ring, a crank handle connected with the blade holding device for facilitating the rotation thereof, a frame surrounding the blade holder and having its respective ends journaled on the axis of the blade holder and on the concentric ring, sharpening rolls provided with trunnions journaled in the frame, planetary pinions carried by the outer ends of the the stationary gear, and cooperative engaging members on the axis or the blade holding and clamping device and on the frame for insuring rotation 01" the frame about the axis of the blade holding and clamping device during rotation or the latter.

in testimony whereof I afiix my signature,

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